In a message dated 31/05/02 17:41:34 GMT Daylight Time, dardal@xxxxxxxxxxxxxxx writes: << Calculating the stresses in a pipe based on pressure, pipe ID and wall thickness is not difficult. If you can provide me this information, and the copper alloy used (I can hopefully find info on the strength of the material) I may be able to do some rough calculations and tell you if the material selection is improper. My guess though is that if they use it in a large scale over there, it should be fine. Here in the US, often the "safety" regulations go beyond sense... >> Thanks for the offer D*2, but the simple solution is probably to play safe and go for steel pipes like the original. I spoke to the guy at the shop where they fitted the faulty pipe today and he is eager to redo the job to the highest standard. Right now, I believe he would fit titanium pipes if I demanded it in order to preserve his reputation and settle the matter. Best wishes, Tony V.